Carpenter&#39;s square.



No. 788,223. n PATBNTBD APR. 25, 1905.

J. R. SIMPSON. *Y

CARPENTERS SQUARE.

`APPLICATION FILED JUNE 11, 19011.

1 Vfi 1 V19 5 7 jfl/77,0500

mm mi lUNTTn STATES Patented April 25, 1905.

PATENT lilrrics.

CARPENTERS SQUARE.

SPECIFICATION forming part of Letters Patent No. "788,223, dated April 25, 1905. Application filed June 11, 1904. Serial No. 212,177.

To all whom it mwy/ concern:

Be it known that I, Jol-1NR. SIMPSON, acitizen of the United States, residing at Chicago,- in the county of Cook and State of Illinois, have invented new and useful Improvements in Carpenters Squares, of which the following is a specification.

This invention relates to a carpenters steel square, which is generally made with two limbs, one being about two feet long, while the other has a length of sixteen inches. A tool of this size and shape is unhandy to carry with other tools and difficult to secure in an ordinary hand tool-box. To overcome this objection, I have devised a square one limb of which is to be folded so that it may lie against the other limb for ease of transportation without sacrificing the rigidity or trueness of the square when opened for use.

The construction is such that the square may be opened or folded very quickly, and when opened the movablelimb is so connected to the stationary one by interlocking parts that it is held perfectly true and free from play where the members are joined.

In the accompanying drawings, Figure lis a face view of my improved folding square ready for use. Fig. 2 is a similar view of the square folded. Fig. 3 is an enlarged detail view, partly in section, illustrating the joint between the two arms of the square when open. Fig. 4 is a like view showing the square folded. Fig. 5 is an edge view of the square looking in the direction of the arrow A, Fig.

l. Fig. 6 is a sectional view on the line 6 6 of Fig. 3.

3 has a notch 6, preferably V-shaped, cut

therein, for a purpose hereinafter described. The lower end of the part 4 of the limb 2 is made with a tenon 7 to fit snugly within the notch 5 and has formed thereon shoulders 8 of V or other shape, which are adapted to enter the notches 6 when the square is open for use, as may be seen in Fig. I.

The numerals 9 and l() indicate tighteningscrews which pass through the part 3 in the central line of the limb 2, while ll indicates a steady-block riveted or otherwise fastened within the mortise below the screw l0. The sides of the steady-block are by preference tapered. The tenon 7 has a tapered notch l2, formed in its lower end and adapted to fit over the steady-block ll and screw 10, and a central longitudinal slot 13, through which the screw 9 passes.

Then the square is in operative position, the shoulders 8 and notch l2l on the part 4 of the limb 2 engage, respectively, with the V- shaped notches 6 on the part 2, and the steadyblock l1 being held rigidly in this position by tightening the screws 9 and 10. To fold the square, the screws are loosened and the part 4 drawn endwise until the lower end of the slot 13 strikes the pin 9. In this position the shoulders 8 are drawn out of the notches 6 and the notch l2 released from the steadyblock 11. The part 4 may now be turned on the screw 9 as a pivot until it rests against the limb l, as shown in Fig. 2. The screws 9 and 10 may now be tightened to hold the part 4 in folded position. It is unnecessary to describe the manner of opening' the square; this will be readily understood from the above description.

The notches 6 and the shoulders 8 are not necessarily made V-shaped, as shown in the drawings; but I consider that form preferable across said mortise, and a steady-block havslot and forming a pivot for the second part ing inclined sides or faces, and the other part of said limb. 1o of said first-named limb having a tenon on its In testimony whereof I affix my signature in end provided with a longitudinal slot'J and hzivpresence of two Witnesses.

5 ing a notch adapted to engage said steady- JOHN R. SIMPSON.

block, and inclined shoulders on said part to Witnesses: interlock with the notch on the inst-mentioned W. F. HERMANN,

part, one of said screws passing through said BERNARD MCNEIL. 

